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Date: Tue, 29 Mar 2011 16:53:33 +0100
From: Ian Campbell <Ian.Campbell@...rix.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
CC: "linux-pm@...ts.linux-foundation.org"
<linux-pm@...ts.linux-foundation.org>,
Shriram Rajagopalan <rshriram@...ubc.ca>,
"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] PM / Hibernate: Introduce
CONFIG_HIBERNATE_INTERFACE
Hi Rafael,
On Sat, 2011-03-26 at 11:29 +0000, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
>
> Xen save/restore is going to use hibernate device callbacks for
> quiescing devices and putting them back to normal operations and it
> would need to select CONFIG_HIBERNATION for this purpose. However,
> that also would cause the hibernate interfaces for user space to be
> enabled, which might confuse user space, because the Xen kernels
> don't support hibernation. Moreover, it would be wasteful, as it
> would make the Xen kernels include a substantial amount of code that
> they would never use.
>
> To address this issue introduce new power management Kconfig option
> CONFIG_HIBERNATE_INTERFACE, such that the hibernate interfaces for
> user space and the image-handling code will depend on it and it will
> select CONFIG_HIBERNATION. Then, Xen save/restore will be able to
> select CONFIG_HIBERNATION without dragging the entire hibernate code
> along with it.
>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Were you planning to put this forward for 2.6.39 or are you waiting for
2.6.40?
> Tested-by: Shriram Rajagopalan <rshriram@...ubc.ca>
Shriram,
Is the additional Xen side patch still the same as in
<1299906483-31053-1-git-send-email-rshriram@...ubc.ca> ? Is there
anything else which isn't already in upstream?
Ian.
> ---
> arch/x86/power/Makefile | 3 ++-
> include/linux/suspend.h | 15 +++++----------
> kernel/power/Kconfig | 4 ++++
> kernel/power/Makefile | 4 ++--
> kernel/power/main.c | 2 +-
> kernel/power/power.h | 6 +++---
> 6 files changed, 17 insertions(+), 17 deletions(-)
>
> Index: linux-2.6/kernel/power/Kconfig
> ===================================================================
> --- linux-2.6.orig/kernel/power/Kconfig
> +++ linux-2.6/kernel/power/Kconfig
> @@ -19,8 +19,12 @@ config SUSPEND_FREEZER
> Turning OFF this setting is NOT recommended! If in doubt, say Y.
>
> config HIBERNATION
> + bool
> +
> +config HIBERNATE_INTERFACE
> bool "Hibernation (aka 'suspend to disk')"
> depends on SWAP && ARCH_HIBERNATION_POSSIBLE
> + select HIBERNATION
> select LZO_COMPRESS
> select LZO_DECOMPRESS
> ---help---
> Index: linux-2.6/kernel/power/Makefile
> ===================================================================
> --- linux-2.6.orig/kernel/power/Makefile
> +++ linux-2.6/kernel/power/Makefile
> @@ -6,7 +6,7 @@ obj-$(CONFIG_PM_SLEEP) += console.o
> obj-$(CONFIG_FREEZER) += process.o
> obj-$(CONFIG_SUSPEND) += suspend.o
> obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
> -obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \
> - block_io.o
> +obj-$(CONFIG_HIBERNATE_INTERFACE) += hibernate.o snapshot.o swap.o \
> + user.o block_io.o
>
> obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
> Index: linux-2.6/include/linux/suspend.h
> ===================================================================
> --- linux-2.6.orig/include/linux/suspend.h
> +++ linux-2.6/include/linux/suspend.h
> @@ -229,7 +229,7 @@ struct platform_hibernation_ops {
> void (*recover)(void);
> };
>
> -#ifdef CONFIG_HIBERNATION
> +#ifdef CONFIG_HIBERNATE_INTERFACE
> /* kernel/power/snapshot.c */
> extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
> static inline void __init register_nosave_region(unsigned long b, unsigned long e)
> @@ -248,7 +248,9 @@ extern unsigned long get_safe_page(gfp_t
> extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
> extern int hibernate(void);
> extern bool system_entering_hibernation(void);
> -#else /* CONFIG_HIBERNATION */
> +#else /* !CONFIG_HIBERNATE_INTERFACE */
> +static inline void register_nosave_region(unsigned long b, unsigned long e) {}
> +static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
> static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
> static inline void swsusp_set_page_free(struct page *p) {}
> static inline void swsusp_unset_page_free(struct page *p) {}
> @@ -256,7 +258,7 @@ static inline void swsusp_unset_page_fre
> static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
> static inline int hibernate(void) { return -ENOSYS; }
> static inline bool system_entering_hibernation(void) { return false; }
> -#endif /* CONFIG_HIBERNATION */
> +#endif /* !CONFIG_HIBERNATE_INTERFACE */
>
> #ifdef CONFIG_PM_SLEEP
> void save_processor_state(void);
> @@ -298,13 +300,6 @@ static inline bool pm_wakeup_pending(voi
> extern struct mutex pm_mutex;
>
> #ifndef CONFIG_HIBERNATION
> -static inline void register_nosave_region(unsigned long b, unsigned long e)
> -{
> -}
> -static inline void register_nosave_region_late(unsigned long b, unsigned long e)
> -{
> -}
> -
> static inline void lock_system_sleep(void) {}
> static inline void unlock_system_sleep(void) {}
>
> Index: linux-2.6/arch/x86/power/Makefile
> ===================================================================
> --- linux-2.6.orig/arch/x86/power/Makefile
> +++ linux-2.6/arch/x86/power/Makefile
> @@ -4,4 +4,5 @@ nostackp := $(call cc-option, -fno-stack
> CFLAGS_cpu.o := $(nostackp)
>
> obj-$(CONFIG_PM_SLEEP) += cpu.o
> -obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o
> +obj-$(CONFIG_HIBERNATE_INTERFACE) += hibernate_$(BITS).o \
> + hibernate_asm_$(BITS).o
> Index: linux-2.6/kernel/power/main.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/main.c
> +++ linux-2.6/kernel/power/main.c
> @@ -156,7 +156,7 @@ static ssize_t state_show(struct kobject
> s += sprintf(s,"%s ", pm_states[i]);
> }
> #endif
> -#ifdef CONFIG_HIBERNATION
> +#ifdef CONFIG_HIBERNATE_INTERFACE
> s += sprintf(s, "%s\n", "disk");
> #else
> if (s != buf)
> Index: linux-2.6/kernel/power/power.h
> ===================================================================
> --- linux-2.6.orig/kernel/power/power.h
> +++ linux-2.6/kernel/power/power.h
> @@ -13,7 +13,7 @@ struct swsusp_info {
> unsigned long size;
> } __attribute__((aligned(PAGE_SIZE)));
>
> -#ifdef CONFIG_HIBERNATION
> +#ifdef CONFIG_HIBERNATE_INTERFACE
> /* kernel/power/snapshot.c */
> extern void __init hibernate_image_size_init(void);
>
> @@ -53,10 +53,10 @@ extern int hibernation_snapshot(int plat
> extern int hibernation_restore(int platform_mode);
> extern int hibernation_platform_enter(void);
>
> -#else /* !CONFIG_HIBERNATION */
> +#else /* !CONFIG_HIBERNATE_INTERFACE */
>
> static inline void hibernate_image_size_init(void) {}
> -#endif /* !CONFIG_HIBERNATION */
> +#endif /* !CONFIG_HIBERNATE_INTERFACE */
>
> extern int pfn_is_nosave(unsigned long);
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xensource.com
> http://lists.xensource.com/xen-devel
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